Building an inline 6 Chevy 250 engine
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==Engine ID== | ==Engine ID== | ||
| − | Obviously casting numbers and VIN stampings can be a big help. Chevy inline 6 casting numbers can usually be found just above the starter on the passenger side of the block. | + | ===Casting numbers, date codes, and suffix codes=== |
| + | Obviously casting numbers and VIN stampings can be a big help. Chevy inline 6 casting numbers can usually be found just above the starter on the passenger side of the block. | ||
| + | On the block there will be foundry ID codes, for instance "CON3". This is no help in ID'ing the engine. | ||
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| + | There may be a date code cast into the block. Example- "A 30 2": Jan 30 of a year ending in 2. If the engine is a 250, that would be 1972. | ||
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| + | The suffix code (also called the "application" code) will be at the end of a string of letters and numbers (that's why it's called a suffix). The suffix string is usually a letter followed by a date code, followed by 1, 2 or 3 letter code. This is found in the area near the distributor, above the fuel pump. The suffix string of letters/numbers are always stamped in, not cast into the block like the date code or foundry ID code. | ||
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| + | There may also be a partial VIN number stamped in a separate string of numbers near the suffix string. If the block is missing the suffix and partial VIN, there's no way to know what the engine might have come in originally, unless there were other external clues like a carb w/a governor on it (would be on a heavy truck or bus), or if it had a large bellhousing and a HD "granny low" trans (also HD truck/bus application). If the crankshaft has a pilot bushing in it, that would mean it had been used w/an auto trans- although this could have been added later. | ||
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| + | ===Deck height=== | ||
The deck height of the Chevy 230 and 250 inline 6 engines is shorter than the 292 inline 6 engine. That means the pushrod cover is shorter on those engines than on the 292 Chevy 6, as seen below. | The deck height of the Chevy 230 and 250 inline 6 engines is shorter than the 292 inline 6 engine. That means the pushrod cover is shorter on those engines than on the 292 Chevy 6, as seen below. | ||
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